Charity donation but a percentage of the sale price

Hello.

I am currently using this great software to build our shop, question I have, If i were to create a special sections which is based around particular items that give a percentage of the sale to my designated charity.

So run down,

seperate section containing special items.
when purchased a percentage of the sale is then donated.

example product, £2.00 per item and 50% goes to charity and 50% to the shop

if this viable and at all possible?

Any help will be great.
Dave

Is it like posting amounts to different places right away or you will consolidate and donate later ?

Unsure really as I am not 100% how the charities work but personally would prefer instant to the charity. I would assume if we were to consilidate the money we would need to be audited but thats a charity thing I think.